If I remember, you started VERY late in the school year, didn't you??
That's just about the hardest thing to walk into-- a group of kids who see you as either an interloper of "not our real" teacher.
What do you teach? Let's see if the people here can help you a bit with your preparation.
Instead of a pep talk, here's my advice: play this one week at a time. Make SURE you know exactly what you're doing before you step foot into that classroom. "I'm new" isn't an excuse when it comes to not knowing your material... the fact that you'll get better next year doesn't help this year's kids. They deserve the very best teacher you can be. So let's see what we can do to help you do your job better-- THAT will help you get the confidence you need.
As you gain experience, the classroom management will get easier, as will the rest. But what you lack in experience, you can make up in preparation.
This week and weekend, block out what you're teaching each week from now until the end of school. (Yes, I realize I'm talking some serious time here planning.) Then become as close to an instant expert as you can on the material you'll expect the kids to know.
Repeat next weekend, though the long range planning will already be done, so it will require much less work.
I would let all the other stuff-- the books, the projects, all that-- slide while I got a handle on the content. Without you knowing that material, you can't possibly hope to teach it to the kids.
I teach math, so this is a total hunch, but why not take a look at this: http://www.amazon.com/Complete-Idiot.../dp/1592571158
to help you with grammar? I bet they're as concise and thorough there as they are in their other guides.
This summer, when you have the luxury of time, you can work out all the fun stuff, the supplements, the projects. For the next month or so, I would concentrate all my efforts on the material.